304 vs 316 Stainless Steel for Cookware

The short answer

304 and 316 are both food-grade austenitic stainless steels. The difference is that 316 contains roughly 2 to 3 percent molybdenum and 304 contains none, and molybdenum is what resists pitting corrosion from chlorides — salt. In a kitchen that matters in one specific situation: salty or acidic liquid sitting in a pan for a long time. For food that passes through a pan in minutes, 304 is entirely sufficient, and almost every clad pan sold uses it.

Side by side

Those chloride figures come from published engineering reference data, cited below. They describe sustained immersion in solutions of that concentration, which is a continuous-exposure industrial condition rather than a half-hour of salted pasta water — the point is the ratio between the two grades, not a kitchen threshold.

How 304 relates to 18/10, 18/8 and 18/0

Cookware brands rarely print "304" on a pan. They print 18/10 or 18/8, which are the chromium and nickel percentages, and both of those sit inside the 304 family. 18/0 is a different animal: it has chromium and effectively no nickel, which makes it magnetic, cheaper and less corrosion-resistant, and it belongs to the 400 series rather than 304.

So the practical hierarchy on a cooking surface runs: 18/0 at the bottom, 18/8 and 18/10 in the middle as 304-family steels, and 316-series at the top. 18/10 vs 18/8 vs 18/0 works through the first part of that in detail. This page is about the step above it.

One wrinkle worth knowing: 316Ti, which is what Heritage Steel uses, is 316 with titanium added. The titanium stabilises the alloy against a form of attack that happens at weld seams, and it is used in cookware partly for strength and partly for marketing clarity.

What pitting actually is

Stainless steel does not resist corrosion because it is inert. It resists corrosion because chromium reacts with oxygen to form an invisible, self-repairing oxide film on the surface — the passive layer. Scratch it and it reforms; expose it to oxygen and it stays.

Chlorides are the one common household chemical that attacks that film locally rather than generally. A chloride ion finds a weak point, breaks through the passive layer at a single spot, and corrosion then proceeds downward into a tiny pit instead of spreading across the surface. Molybdenum interferes with that process: it slows pit initiation and suppresses pit growth once started.

That is why pitting is the only chemical failure mode that genuinely matters in a stainless pan, and why it looks the way it does — a scatter of tiny dark dots in the base rather than general rust. The mechanism is also behind why stainless cookware can appear to rust, and it is why dishwasher detergent gets a mention: it contains chlorides.

Does it matter in a kitchen?

Usually not, and we would rather say so than sell the upgrade.

Where 304 is fine: searing, frying, boiling pasta, sauces finished in minutes, anything you cook and then wash. Food is in contact with metal briefly, at temperature, and then removed. The overwhelming majority of what a home kitchen does.

Where 316 earns its premium: salt or brine left in a pan, tomato sauce simmered for hours and then left to cool overnight, stock reduced over an afternoon, brining in a stock pot, and undissolved salt sitting on a dry hot base — which is the classic way a pan gets pitted. It also matters more in pots than in pans, because liquid sits in a pot.

The habit that beats the alloy: add salt after the water boils, never leave salted or acidic liquid in a pan to cool overnight, and rinse and dry rather than leaving a pan to soak. Those three habits do more for a 304 pan than upgrading to 316 does for a carelessly used one.

What this means for buying

Do not pay a large premium for 316 unless the way you cook matches the list above. The alloy is a genuine improvement in a narrow condition, not a general upgrade, and a 316 pan with a thin gauge or a low oven rating is still a worse pan than a well-built 304 one.

Do take it as a tiebreaker. Heritage Steel's 316Ti comes attached to five-ply construction, an 800F rating and US manufacturing, so the alloy is one reason among several — which is why it is our top pick in best 5-ply stainless steel cookware and features in buy-it-for-life cookware.

And be cautious about the nickel question, which often arrives attached to this one. Both grades contain nickel at around 10 percent. If nickel is the concern, neither 304 nor 316 solves it — see is stainless steel cookware safe and best non-toxic stainless cookware.